I’m 72, just had my ears cleaned and tested. My ability to hear highs is a normal gradual downward slope. Even when young, great hearing: any speaker in any space, even with a lot of room treatment will not be ’flat’.
Way back when I bought a multi-band eq, (I cannot remember what it was). A good friend who is an AV consultant came over. We adjusted, tested, measured, moved the speakers bit by bit, marked up pre-printed graphs.
Oh Boy! After a while, I came to the conclusion: beware ’perfection’. It just wasn’t as involving as it had been. Out, gave it to a friend.
IOW, you may find a simple treble boost does it well enough. My speakers were designed with L Pads ’Brilliance’ and ’Presence’. I was considering removing them, temp bypassed, and found, they are needed, speakers were designed for them to be in the center of their range, and vary attenuation up/dn from there. It will be ’Brilliance to the Rescue’ as I continue to age.
That Rockville is surprisingly inexpensive, at $150. you could get one, try it, see how you like the results, then if it is working, keep researching for something you might prefer.
I am a big fan of remote balance, because, the better your system images, you find occasional tracks that benefit a lot from a small amount of balance adjustment. Using an equalizer for balance is great for most tracks, but ’fixed’, not flexible for this or that track.
Another idea, also only $150. is to try my favorite: Chase Remote Line Controller, RLC-1. I would never live without one. It gives you, from your listening position: remote volume, balance, treble, bass, and mute which can be handy.
You may find, the remote treble is enough, and, when sharing your music with others, put things back to ’normal’, then juice it up again for yourself.
https://www.ebay.com/itm/Chase-Remote-Line-Controller-RLC-1/254708363331?hash=item3b4dcd3043:g:huIAA...
